Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"python using java snippets" » "python using data snippets"
"vao thuc dan snippets" » "va thuc dan snippets", "bao thuc dan snippets", "van thuc dan snippets", "vao thuc hanh snippets", "vao hoc dan snippets", "vao thuc vat snippets"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("vao thuc dan snippets") or ("python using java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("vao thuc dan snippets") OR ("python using java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( vao thuc dan snippets ) or ( python using java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("vao thuc dan snippets") or ("python using java snippets"))) or ("locating bug core snippets"))*.